C#應用鉤子取得按鍵信息的辦法。本站提示廣大學習愛好者:(C#應用鉤子取得按鍵信息的辦法)文章只能為提供參考,不一定能成為您想要的結果。以下是C#應用鉤子取得按鍵信息的辦法正文
本文實例講述了C#應用鉤子取得按鍵信息的辦法。分享給年夜家供年夜家參考。詳細以下:
窗體相干代碼:
using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Linq; using System.Text; using System.Windows.Forms; using System.Runtime.InteropServices; using System.Threading; using ReadBadCode; namespace gouzi { public partial class Form2 : Form { BarCodeHook BarCode = new BarCodeHook(); public Form2() { InitializeComponent(); BarCode.BarCodeEvent += new BarCodeHook.BarCodeDelegate(BarCode_BarCodeEvent); } private delegate void ShowInfoDelegate(BarCodeHook.BarCodes barCode); private void ShowInfo(BarCodeHook.BarCodes barCode) { if (this.InvokeRequired) { this.BeginInvoke(new ShowInfoDelegate(ShowInfo), new object[] { barCode }); } else { textBox1.Text = barCode.KeyName;//鍵名 textBox2.Text = barCode.VirtKey.ToString();//虛擬碼 textBox3.Text = barCode.ScanCode.ToString();//掃描碼 textBox4.Text = barCode.AscII.ToString();//AscII textBox5.Text = barCode.Chr.ToString();//字符 textBox6.Text = barCode.IsValid ? barCode.BarCode : ""; //在這裡停止鍵入值 } } void BarCode_BarCodeEvent(BarCodeHook.BarCodes barCode) { ShowInfo(barCode); } private void Form2_Load(object sender, EventArgs e) { BarCode.Start(); } private void Form2_StyleChanged(object sender, EventArgs e) { BarCode.Stop(); } } }
後台類代碼:
using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Runtime.InteropServices; using System.Reflection; namespace ReadBadCode { class BarCodeHook { public delegate void BarCodeDelegate(BarCodes barCode); public event BarCodeDelegate BarCodeEvent; public struct BarCodes { public int VirtKey; //虛擬碼 public int ScanCode; //掃描碼 public string KeyName; //鍵名 public uint AscII; //AscII public char Chr; //字符 public string BarCode; //條碼信息 public bool IsValid; //條碼能否有用 public DateTime Time; //掃描時光 } private struct EventMsg { public int message; public int paramL; public int paramH; public int Time; public int hwnd; } // 裝置鉤子 [DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)] private static extern int SetWindowsHookEx(int idHook, HookProc lpfn, IntPtr hInstance, int threadId); // 卸載鉤子 [DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)] private static extern bool UnhookWindowsHookEx(int idHook); // 持續下一個鉤子 [DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)] private static extern int CallNextHookEx(int idHook, int nCode, Int32 wParam, IntPtr lParam); //獲得鍵名的字符串 [DllImport("user32", EntryPoint = "GetKeyNameText")] private static extern int GetKeyNameText(int lParam, StringBuilder lpBuffer, int nSize); //將256個虛擬鍵復制到指定的緩沖區中 [DllImport("user32", EntryPoint = "GetKeyboardState")] private static extern int GetKeyboardState(byte[] pbKeyState); //將指定的虛擬鍵碼和鍵盤狀況為響應的字符串 [DllImport("user32", EntryPoint = "ToAscii")] private static extern bool ToAscii(int VirtualKey, int ScanCode, byte[] lpKeyState, ref uint lpChar, int uFlags); //聲明界說回調函數 delegate int HookProc(int nCode, Int32 wParam, IntPtr lParam); BarCodes barCode = new BarCodes(); int hKeyboardHook = 0; string strBarCode = ""; private int KeyboardHookProc(int nCode, Int32 wParam, IntPtr lParam) { if (nCode == 0) { EventMsg msg = (EventMsg)Marshal.PtrToStructure(lParam, typeof(EventMsg)); if (wParam == 0x100) //WM_KEYDOWN = 0x100 { barCode.VirtKey = msg.message & 0xff; //虛擬碼 barCode.ScanCode = msg.paramL & 0xff; //掃描碼 StringBuilder strKeyName = new StringBuilder(255); if (GetKeyNameText(barCode.ScanCode * 65536, strKeyName, 255) > 0) { barCode.KeyName = strKeyName.ToString().Trim(new char[] { ' ', '\0' }); } else { barCode.KeyName = ""; } byte[] kbArray = new byte[256]; uint uKey = 0; GetKeyboardState(kbArray); if (ToAscii(barCode.VirtKey, barCode.ScanCode, kbArray, ref uKey, 0)) { barCode.AscII = uKey; barCode.Chr = Convert.ToChar(uKey); } if (DateTime.Now.Subtract(barCode.Time).TotalMilliseconds > 50) { strBarCode = barCode.Chr.ToString(); } else { if ((msg.message & 0xff) == 13 && strBarCode.Length > 3) //回車 { barCode.BarCode = strBarCode; barCode.IsValid = true; } strBarCode += barCode.Chr.ToString(); } barCode.Time = DateTime.Now; if (BarCodeEvent != null) BarCodeEvent(barCode); //觸發事宜 barCode.IsValid = false; } } return CallNextHookEx(hKeyboardHook, nCode, wParam, lParam); } // 裝置鉤子 public bool Start() { if (hKeyboardHook == 0) { //WH_KEYBOARD_LL = 13 hKeyboardHook = SetWindowsHookEx(13, new HookProc(KeyboardHookProc), Marshal.GetHINSTANCE(Assembly.GetExecutingAssembly().GetModules()[0]), 0); } return (hKeyboardHook != 0); } // 卸載鉤子 public bool Stop() { if (hKeyboardHook != 0) { return UnhookWindowsHookEx(hKeyboardHook); } return true; } } }
【留意】要想測試現實的後果,必需履行編譯後的Exe文件,在開辟情況直接運轉會沒有用果的。
願望本文所述對年夜家的C#法式設計有所贊助。